superb-warfare/src/main/resources/data/superbwarfare/recipes/iron_barrel_crafting.json

{
  "type": "minecraft:crafting_shaped",
  "category": "misc",
  "pattern": [
    "aaa"
  ],
  "key": {
    "a": {
      "item": "minecraft:iron_ingot"
    }
  },
  "result": {
    "item": "superbwarfare:iron_barrel",
    "count": 1
  }
}